The principle of accurate positioning of mobile phone WiFi is actually very simple, which is roughly as follows. The WiFi chip of the mobile phone will scan the MAC (physical address, hardware address) and signal strength of the surrounding WiFi routers (these information are public), and then transmit them to the background server through the Internet. The background server has the actual latitude and longitude position information of these routers, and then the actual geographical position of the mobile phone is calculated according to the signal strength. The general error is about 20 meters to 100. Of course, the display on the map is very accurate.